2-HEPTENE-4,6-DIYNOIC ACID, 7-CYANO-, (E)- 4-02-00-02346 (Beilstein Handbook Reference) 463-15-0 7-Cyano-trans-2-heptene-4,6-diynoic acid BRN 1703425 Diatretyne 2 Diatretynnitril